Emily Dickinson Lexicon

PRO-NA'TION, n. [from L. pronus, having the face downward.]

1. Among anatomists, that motion of the radius whereby the palm of the hand is turned downward; the act of turning the palm downward; opposed to supination. – Encyc. Coxe.
2. That position of the hand, when the thumb is turned toward the body, and the palm downward. – Parr.